Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual vaga ocorreu em 16 de fevereiro de 2009?
 ###Tabelas: CREATE TABLE top_10_singles (top_10_singles_id AUTO_INCREMENT PRIMARY KEY, Entered [A ] VARCHAR, Weeks in top 10 INT, Single VARCHAR, Artist VARCHAR, Peak INT, Peak reached [A ] VARCHAR, Weeks at number 1 INT) CREATE TABLE formula_one_results (formula_one_results_id AUTO_INCREMENT PRIMARY KEY, Year INT, Team VARCHAR, Chassis VARCHAR, Engine VARCHAR, Points INT) CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Replaced by VARCHAR, Date of appointment VARCHAR, Position in table VARCHAR) CREATE TABLE statistics_at_michigan (statistics_at_michigan_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Tackles INT, Assists INT, Totals INT, Interceptions INT, High Game Tackles VARCHAR) CREATE TABLE ibc_tv_stations (ibc_tv_stations_id AUTO_INCREMENT PRIMARY KEY, Branding VARCHAR, Callsign VARCHAR, Ch. # VARCHAR, Power kW VARCHAR, Station Type VARCHAR, Location (Transmitter site) VARCHAR)  
SELECT Position in managerial_changes FROM managerial_changes WHERE Date of vacancy = 16 February 2009